Berni J. Alder (left) and Kyozi Kawasaki (right): Boltzmann Medallist 2001
The citations read as follows:
Berni J. Alder:
Inventing the technique of molecular dynamics simulation and showing that with such "computer experiments" important discoveries in the field of statistical mechanics can be made, in particular the melting/crystallization transition of hard spheres and the long-time decay of auto-correlation functions in fluids.
His contribution to our understanding of dynamic phenomena in condensed matter systems, in particular the mode-coupling theory of fluids near criticality, and nonlinear problems, such as critical phenomena in sheared fluids and phase separations.